Is there a possibility of getting pregnant on depo?

I was suppose to get my next depo shot in December 19th but couldn't get in to see my doctor, I had unprotected sex on the 6th and the 9th. I've been feeling really off lately like having some pregnancy symptoms such as leg cramps, nausea, overly tired, massive mood swings, gaining weight, no period but I had a period at the end of October going into November and it last 3 weeks but haven't gotten one since... Could I be pregnant or is it just effects of the depo leaving my system still?

I was concerned because I had the exact same symptoms in early pregnancy with both of my daughters when I was around 5 weeks, I don't want to continue with depo, I've made an appointment to go on the pill but that's not until the 15th

It's always possible - even while on the best of birth control, pregnancy is possible. If these are the same symptoms as your earlier pregnancies, it just might be. Be sure to have a pregnancy test before starting on the birth control pill. If you aren't already pregnant, until you are well established on the pill, use a condom and spermicide, or abstain from sex altogether. That's the only way to be 100% sure not to get pregnant. EJ23